How to Address Bearing Corrosion Caused by Fluid Leaks at the Housing and Drive Shaft of a High-Temperature Centrifugal Fan?

How to Address Bearing Corrosion Caused by Fluid Leaks at the Housing and Drive Shaft of a High-Temperature Centrifugal Fan?

During the design or manufacturing phase of a high-temperature centrifugal fan, there are often no seals between the housing and the drive shaft because sealing is not required. This is because this section of the fan is under negative pressure during operation, so no air leaks occur. However, once the high-temperature centrifugal fan begins operation, due to factors such as deformation of the piping network, changes in resistance, and changes in the medium, it becomes necessary to add a seal to the shaft bore in the outer cover to prevent air leakage. Currently, there are the following two options. Option 1 Remove the housing of the high-temperature centrifugal fan, take off the impeller, move the drive unit, and install a new O-ring or mechanical seal. The advantage of this method is that it allows for the installation of a new sticker-type seal. Option 2 A simple sealing ring assembly is added without the need to disassemble the high-temperature centrifugal fan. Each assembly consists of a housing, two stamped parts, and four semicircular components. First, place the two components with sleeves onto the shaft and weld the grooves to the bearing housing to form a ring. Next, slide the two semicircular components onto the shaft—without the term “shell”—with the grooves facing the housing, and weld them to form a ring. In this way, the drive shaft passes through the two rings, positioning the grooves facing each other. Then, while ensuring that the clearance between the inner ring and the drive shaft is uniform, weld the ring marked “outer cover” to the outer cover. Next, weld the hex heads of the bolts on the two stamped parts to the housing so that one end of each stamped part can press against the ring. Cut the sealing ring to size, wrap it around the ring groove, tighten the nuts on the compression section, use one end of the compression section to compress the ring, and install the recommended seasoning sticker. This method requires only initial processing of the workpiece, with very little installation work required in later stages, making it ideal for high-temperature centrifugal fans that do not require a sealed design. Corroded bearings must also be replaced.